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You mustn't go too high,or you()dangerous Awill be B are C w

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You mustn't go too high,or you()dangerous Awill be B are C would be Dis going to
We have known each other(）Asince we were youngBafter we were young Cwhen we are young D if we are young
分别为选A 和 A
再问： 谢谢你的回答能麻烦你告诉一下原因吗？
再答： 不好意思。。第一个选择错了。。。是选择C。。因为此句中是虚拟语气，如果你爬的太高就可能会有受伤的危险，是表达这个意思 第二句则比较简单，为完成时态，用since
再问： 第二句为什么用完成时呢？能告诉一下吗谢谢
再答： 因为have known就是一个完成的时态啊。。。这句话你可以这么理解。。。自从我们很年轻的时候就认识彼此了。。。这个状态从很久前持续到现在还将继续持续下去！符合现在完成时的解释！
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